Automatic pressurized reservoir bleed valve

F - Mech Eng,Light,Heat,Weapons – 16 – K

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F16K 24/00 (2006.01) F15B 21/04 (2006.01) F16K 24/04 (2006.01)

Patent

CA 2095274

An automatic bleed valve 34 for bleeding air from a pressurized liquid reservoir includes a piston 4 in a piston chamber 25 located in a flow channel leading from the reservoir. A first orifice 6 is provided in a piston passage 24 through the piston 4, and the piston 4 is urged upstream by a resilient spring 8. A second orifice 16 is located in the flow channel. When gas is expelled from the reservoir, the resilient spring 8 will retain the piston 4 in an equilibrium region, allowing the gas to be bled from the reservoir through the flow channel. When liquid beings to flow through the flow channel, the pressure differential over the piston 4 increases, causing the piston 4 to move against a seat 23 of a poppet 5 and seal off the flow channel and the hydraulic reservoir.

Purgeur automatique (34) pour purger l'air d'un réservoir de liquide sous pression, comportant un piston (4) se déplaçant dans un cylindre de piston (25) située dans un conduit d'écoulement venant du réservoir. Un premier orifice (6) est pratiqué dans un passage (24) traversant le piston (4); un ressort résilient (8) maintient le piston (4) à contre-courant. Un deuxième orifice (16) est pratiqué dans le conduit d'écoulement. Lorsqu'il y a expulsion de gaz du réservoir, le ressort résilient (8) maintient le piston (4) dans une position d'équilibre, permettant l'évacuation du gaz et la purge du réservoir par le conduit d'écoulement. Lorsque des liquides commencent à s'écouler dans le conduit, le différentiel de pression agissant sur le piston (4) augmente, ce qui ramène le piston sur son siège (23), assurant l'obturation du conduit et du réservoir hydraulique.

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